tree: ignore false positive ASAN error

gcc complains with

In function ‘nvme_ctrl_lookup_phy_slot’,
    inlined from ‘nvme_configure_ctrl’ at ../src/nvme/tree.c:1798:16:
../src/nvme/tree.c:1736:21: error: ‘strncmp’ specified bound 2 exceeds source size 0 [-Werror=stringop-overread]
 1736 |                     strncmp(entry->d_name, "..", 2) != 0) {
      |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../src/nvme/tree.c:1748:40: error: ‘strdup’ reading 1 or more bytes from a region of size 0 [-Werror=stringop-overread]
 1748 |                                 return strdup(entry->d_name);
      |                                        ^~~~~~~~~~~~~~~~~~~~~
In function ‘nvme_configure_ctrl’:

because d_name is defined as d_name[0] in POSIX but on Linux it is
actually d_name[256] and is a valid NULL terminated string.

Signed-off-by: Daniel Wagner <[email protected]>

src/nvme/tree.c

@@ -1710,6 +1710,8 @@ static char *nvme_ctrl_lookup_subsystem_name(nvme_root_t r,
 	return NULL;
 }
 
+#pragma GCC diagnostic ignored "-Wstringop-overread"
+
 static char *nvme_ctrl_lookup_phy_slot(nvme_root_t r, const char *address)
 {
 	_cleanup_free_ char *target_addr = NULL;
@@ -1746,9 +1748,12 @@ static char *nvme_ctrl_lookup_phy_slot(nvme_root_t r, const char *address)
 				return strdup(entry->d_name);
 		}
 	}
+
 	return NULL;
 }
 
+#pragma GCC diagnostic pop
+
 static int nvme_configure_ctrl(nvme_root_t r, nvme_ctrl_t c, const char *path,
 			       const char *name)
 {